Python贪吃蛇双人大战
晚上家里小朋友要玩贪吃蛇游戏,还要跟我对战,一时半会我没想到去哪里下这样一个游戏,忽然灵机一动,可以自己写一个,顺便还可以跟小朋友展示一下程序员的厉害,于是开工。
原始版本
这是一个很基础的程序,自然不用从头写,在网上随便一搜,找到有人共享的代码,链接如下:https://www.cnblogs.com/qiu2013/p/6087627.html,据说是来源于《Raspberry Pi 用户指南》的代码,我也没有去查。代码如下:
#!/usr/bin/env python import pygame,sys,time,random from pygame.locals import * # 定义颜色变量 redColour = pygame.Color(255,0,0) blackColour = pygame.Color(0,0,0) whiteColour = pygame.Color(255,255,255) greyColour = pygame.Color(150,150,150) # 定义gameOver函数 def gameOver(playSurface): gameOverFont = pygame.font.Font('arial.ttf',72) gameOverSurf = gameOverFont.render('Game Over', True, greyColour) gameOverRect = gameOverSurf.get_rect() gameOverRect.midtop = (320, 10) playSurface.blit(gameOverSurf, gameOverRect) pygame.display.flip() time.sleep(5) pygame.quit() sys.exit() # 定义main函数 def main(): # 初始化pygame pygame.init() fpsClock = pygame.time.Clock() # 创建pygame显示层 playSurface = pygame.display.set_mode((640,480)) pygame.display.set_caption('Raspberry Snake') # 初始化变量 snakePosition = [100,100] snakeSegments = [[100,100],[80,100],[60,100]] raspberryPosition = [300,300] raspberrySpawned = 1 direction = 'right' changeDirection = direction while True: # 检测例如按键等pygame事件 for event in pygame.event.get(): if event.type == QUIT: pygame.quit() sys.exit() elif event.type == KEYDOWN: # 判断键盘事件 if event.key == K_RIGHT or event.key == ord('d'): changeDirection = 'right' if event.key == K_LEFT or event.key == ord('a'): changeDirection = 'left' if event.key == K_UP or event.key == ord('w'): changeDirection = 'up' if event.key == K_DOWN or event.key == ord('s'): changeDirection = 'down' if event.key == K_ESCAPE: pygame.event.post(pygame.event.Event(QUIT)) # 判断是否输入了反方向 if changeDirection == 'right' and not direction == 'left': direction = changeDirection if changeDirection == 'left' and not direction == 'right': direction = changeDirection if changeDirection == 'up' and not direction == 'down': direction = changeDirection if changeDirection == 'down' and not direction == 'up': direction = changeDirection # 根据方向移动蛇头的坐标 if direction == 'right': snakePosition[0] += 20 if direction == 'left': snakePosition[0] -= 20 if direction == 'up': snakePosition[1] -= 20 if direction == 'down': snakePosition[1] += 20 # 增加蛇的长度 snakeSegments.insert(0,list(snakePosition)) # 判断是否吃掉了树莓 if snakePosition[0] == raspberryPosition[0] and snakePosition[1] == raspberryPosition[1]: raspberrySpawned = 0 else: snakeSegments.pop() # 如果吃掉树莓,则重新生成树莓 if raspberrySpawned == 0: x = random.randrange(1,32) y = random.randrange(1,24) raspberryPosition = [int(x*20),int(y*20)] raspberrySpawned = 1 # 绘制pygame显示层 playSurface.fill(blackColour) for position in snakeSegments: pygame.draw.rect(playSurface,whiteColour,Rect(position[0],position[1],20,20)) pygame.draw.rect(playSurface,redColour,Rect(raspberryPosition[0], raspberryPosition[1],20,20)) # 刷新pygame显示层 pygame.display.flip() # 判断是否死亡 if snakePosition[0] > 620 or snakePosition[0] < 0: gameOver(playSurface) if snakePosition[1] > 460 or snakePosition[1] < 0: for snakeBody in snakeSegments[1:]: if snakePosition[0] == snakeBody[0] and snakePosition[1] == snakeBody[1]: gameOver(playSurface) # 控制游戏速度 fpsClock.tick(5) if __name__ == "__main__": main()
此代码实现了基本功能,主循环中先判断按键事件,然后调整蛇的位置,若蛇吃到了豆子(这个代码里叫树莓,我嫌名字太长,改成了习惯的豆子),则增加蛇的长度,并重新生成豆子,接着刷新显示,最后判断是否死亡,若死亡则调用gameOver。
当然这个是满足不了小朋友的需求的,小朋友尝试了一下,马上提取了如下需求:
要跟我一起玩,也就是要有两条蛇,每人控制一个,看谁吃得多。
蛇死了之后不要结束,太麻烦,改为重新开始。
蛇的颜色要能自己定。
要能看出来蛇头,即蛇头需要用不同的颜色。
豆子数量太少,每次才一个,要一下子出现很多豆子,可以随便吃。
看来天下用户都一样,总是各种需求。于是为了便于以后的修改,我把蛇相关的操作提取了一个蛇的类如下。
蛇类
class Snake: def __init__(self, color, headColor, ctrlKeys): self.color = color self.headColor = headColor self.ctrlKeys = ctrlKeys #按[上,下,左,右]的顺序 self.direction = random.choice([-2,2,-1,1]) # 方向[-2,2,-1,1]分别表示[上,下,左,右] x = random.randrange(5,SCREEN_WIDTH/20-5) y = random.randrange(5,SCREEN_HEIGHT/20-5) self.headPos = [int(x*20),int(y*20)] self.segments = [self.headPos] self.moveAndAdd() self.moveAndAdd() def changeDirection(self, pressKey): directions = [-2,2,-1,1] for direct, key in zip(directions, self.ctrlKeys): if key == pressKey and direct + self.direction != 0: self.direction = direct def moveAndAdd(self): # 根据方向移动蛇头的坐标 if self.direction == 1: self.headPos[0] += 20 if self.direction == -1: self.headPos[0] -= 20 if self.direction == -2: self.headPos[1] -= 20 if self.direction == 2: self.headPos[1] += 20 self.segments.insert(0,list(self.headPos)) # 在蛇头插入一格 def pop(self): self.segments.pop() # 在蛇尾减去一格 def show(self, playSurface): # 画蛇身 for pos in self.segments[1:]: pygame.draw.rect(playSurface,self.color,Rect(pos[0],pos[1],20,20)) # 画蛇头 pygame.draw.rect(playSurface,self.headColor,Rect(self.headPos[0],self.headPos[1],20,20)) def respawnIfDead(self): if self.headPos[0] > SCREEN_WIDTH-20 or self.headPos[0] < 0 or self.headPos[1] > SCREEN_HEIGHT-20 or self.headPos[1] < 0: x = random.randrange(5,SCREEN_WIDTH/20-5) y = random.randrange(5,SCREEN_HEIGHT/20-5) self.direction = random.choice([-2,2,-1,1]) self.headPos = [int(x*20),int(y*20)] self.segments = [self.headPos] self.moveAndAdd() self.moveAndAdd()
后边的请去原作者那里看
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版权声明:本文为CSDN博主「tyst08」的原创文章,遵循 CC 4.0 BY-SA 版权协议,转载请附上原文出处链接及本声明。
原文链接:https://blog.csdn.net/tyst08/article/details/105521505